[http://www.firefox.com Firefox] is a popular open-source graphical web browser from [http://www.mozilla.com Mozilla].

[http://www.firefox.com Firefox] is a popular open-source graphical web browser from [http://www.mozilla.com Mozilla].

== Installing ==

== Installing ==

−

The {{Pkg|firefox}} package can be found in the [[Official Repositories|official repositories]] and can be installed with [[pacman]].

+

Firefox can be [[Pacman|installed]] with the {{Pkg|firefox}} package, available in the [[official repositories]].

−

There are a number of language packs available if English is not your preferred language. To see a list of available language packs, try:

+

There are a number of language packs available for Firefox, other than the standard English. Language packs are usually named as {{ic|firefox-i18n-languagecode}} (where {{ic|languagecode}} can be any language code, such as '''de''', '''ja''', '''fr''', etc.). For a list of available language packs see [https://www.archlinux.org/packages/?sort=&q=firefox-i18n&maintainer=&last_update=&flagged=&limit=100 this].

−

{{bc|$ pacman -Ss firefox-i18n}}

−

If firefox doesn't antialias and hint your font, try to install {{AUR|ttf-ms-fonts}} and take a look at [[Font_Configuration]].

+

If Firefox does not anti-alias and/or hint your fonts, try to install {{AUR|ttf-win7-fonts}} (preferred) or {{AUR|ttf-ms-fonts}} and take a look at [[Font Configuration]].

== Add-ons ==

== Add-ons ==

Firefox is well known for its large library of add-ons which can be used to add new features or modify the behavior of existing features of Firefox. You can find new add-ons or manage installed add-ons with Firefox's "Add-ons Manager."

Firefox is well known for its large library of add-ons which can be used to add new features or modify the behavior of existing features of Firefox. You can find new add-ons or manage installed add-ons with Firefox's "Add-ons Manager."

−

For a list of popular add-ons, see: [https://addons.mozilla.org/en-US/firefox/extensions/?sort=popular Mozilla's add-on list sorted by popularity].

+

For a list of popular add-ons, see [https://addons.mozilla.org/en-US/firefox/extensions/?sort=popular Mozilla's add-on list sorted by popularity].

== Plugins ==

== Plugins ==

−

''See: [[Browser Plugins]]''

+

{{Box||See the main article: [[Browser Plugins]]|#E5E5FF|#FCFCFC}}

To find out what plugins are installed/enabled, enter:

To find out what plugins are installed/enabled, enter:

about:plugins

about:plugins

−

in the Firefox address bar. Or go to ''Addons'' from the main bar drop downs <!-- I use vimperator so I do not know what's the name --> and select the ''Plugins'' tab.

+

in the Firefox address bar or go to the ''Add-ons'' entry in the Firefox Menu and select the ''Plugins'' tab.

+

+

=== GNOME Keyring integration ===

+

Install {{AUR|firefox-gnome-keyring}} from the [[AUR]] to integrate Firefox with [[GNOME Keyring]].

+

+

=== KDE integration ===

+

* To use KDE's KPart technology with Firefox, by embedding different KDE file viewers into the browser, you can install {{Pkg|kpartsplugin}}.

−

=== GNOME integration ===

+

* To get further integration with KDE's Oxygen theme, you can install [http://kde-look.org/content/show.php/?content=117962 Oxygen KDE], a very comprehensive theme that also has color scheme detection, support for Firefox's Persona themes, support for both the Oxygen and Faenza icons and various other customizations.

−

Install {{AUR|firefox-extension-gnome-keyring-git}} from the [[Arch User Repository|AUR]] to integrate Firefox 3.6.x with Gnome-keyring.

−

You can also install {{AUR|firefox-extension-firefoxnotify-git}} to get libnotify/notifyOSD integration.

+

* For integration with KDE’s mime type system and file dialogs, one can use a [https://aur.archlinux.org/packages/firefox-kde-opensuse version of firefox] with OpenSUSE’s patches applied.

=== Dictionaries for spell checking ===

=== Dictionaries for spell checking ===

−

Right click in any text entry field and add the dictionary for the solicited language. Restart Firefox, and click in a text entry field again to enable spell checking.

+

To enable spell checking for a specific language right click on any text field and check the ''Check Spelling'' box. To select a language for spell checking to you have right click again and select your language from the ''Languages'' sub-menu.

−

Or get it from pacman:

+

To get more languages just click ''Add Dictionaries...'' and select the dictionary you want to install from the list.

−

pacman -Ss hunspell

+

+

Alternatively, you can install the {{Pkg|hunspell}} package, available in the [[official repositories]]. You also need to install dictionaries for your language, such as {{Pkg|hunspell-fr}} (for the French language) or {{Pkg|hunspell-he}} (for Hebrew).

Search engines can be added to Firefox through normal add-ons, see [https://addons.mozilla.org/en-US/firefox/search-tools/ this page] for a list of available search engines.

−

If you want to custom one, take a look at: {{ic|~/.mozilla/firefox/xxx.default/searchplugins/}} where xxx is your profile ID).

+

A very extensive list of search engines can be found [http://mycroft.mozdev.org/ here].

−

====arch-firefox-search====

+

Also, you can use the [https://firefox.maltekraus.de/extensions/add-to-search-bar add-to-searchbar] extension to add a search to your search bar from any web site, by simply right clicking on the site's search field and selecting ''Add to Search Bar...''

If you want a manual solution, take a look at {{ic|~/.mozilla/firefox/xxx.default/searchplugins/}} (where xxx is your profile ID).

−

=== Firefox derivatives ===

−

Two different forks of Mozilla Firefox:

−

*Debian’s Iceweasel ([[Wikipedia:Iceweasel]]; http://wiki.debian.org/Iceweasel). It is being developed by Debian and is based on 2.0.

+

==== arch-firefox-search ====

−

*GNU/IceCat ([[Wikipedia:GNU IceCat]]; AUR: {{AUR|icecat}}) - formerly known as GNU IceWeasel, is a web browser distributed by the GNU Project. IceCat is made entirely of free software. It is compatible with the GNU/Linux operating system and almost all of Firefox's addons. GNU/IceCat really can fully replace Firefox.

+

Install the {{Pkg|arch-firefox-search}} package, available in the [[official repositories]], to add Arch-specific searches (AUR, wiki, forum, etc, as specified by user) to the Firefox search toolbar.

−

=== Firefox with better KDE integration ===

+

== Firefox derivatives ==

−

*{{AUR|firefox-kde-opensuse}}

−

:with OpenSUSE patch, integrates better with KDE. OpenSUSE's patch and integration of Firefox with KDE is considered the best by many users.

−

*{{Pkg|kpartsplugin}}

+

* {{App|[[Wikipedia:Mozilla Corporation software rebranded by the Debian project#IceWeasel|Iceweasel]]|A fork of Firefox that is being developed by Debian. The main difference is that it does not include any trademarked Mozilla artwork.|http://wiki.debian.org/Iceweasel|{{AUR|iceweasel}}}}

{{Note|For some more information about Iceweasel's existance see [http://web.glandium.org/blog/?p&#61;97 this blog post].}}

+

* {{App|[[Wikipedia:Gnu IceCat|GNU IceCat]]|A web browser distributed by the GNU Project. It is made entirely of free software and is compatible with the GNU/Linux operating system and almost all of Firefox's addons. |http://www.gnu.org/software/gnuzilla/|{{AUR|icecat}}}}

+

* {{App|[[Wikipedia:Swiftfox|Swiftfox]]|A web browser based on Firefox but optimized for some newer Intel and AMD processors.|http://www.getswiftfox.com/|{{AUR|swiftfox-athlon64}} {{AUR|swiftfox-prescott}} {{AUR|swiftfox-i686}}}}

+

* {{App|Firefox KDE|A version of Firefox that incorporates an OpenSUSE patch for better KDE integration than is possible through simple Firefox plugins.|http://gitorious.org/firefox-kde-opensuse|{{AUR|firefox-kde-opensuse}}}}

Firefox is usually set to open {{ic|mailto}} links with a web application such as Gmail or Yahoo Mail. To set your e-mail client in Firefox to use with {{ic|mailto}} links, go to ''Preferences > Applications'' and modify the ''action'' column corresponding to the {{ic|mailto}} content type. You have set this to the exact location of your e-mail client (e.g. {{ic|/usr/bin/kmail}} for Kmail).

=== Firefox 4 New Menu Bar/Firefox Button ===

=== Firefox 4 New Menu Bar/Firefox Button ===

−

By default, Arch Linux shows the classic layout of the menu bar. To activate the new Firefox 4 layout with the "Firefox" button replacing the menu bar, uncheck View -> Toolbars -> Menubar.

+

{{Merge|Firefox Tweaks|This is just style tweaks, should better keep it in tweak page to keep main page clean.}}

+

To toggle between the new Firefox button and the classic menu bar:

+

* if the button is active, check ''Preferences > Menu Bar'', or right click in the toolbar area and check ''Menu Bar''.

+

* if the menu bar is active, uncheck ''View > Toolbars > Menu Bar'', or right click in the toolbar area and uncheck ''Menu Bar''.

In GNU/Linux, you will just get a plain grey button instead of the new orange one from Windows. However you can change this to either a Firefox icon or the icon followed by the "Firefox" text.

In GNU/Linux, you will just get a plain grey button instead of the new orange one from Windows. However you can change this to either a Firefox icon or the icon followed by the "Firefox" text.

Adding the following to your {{ic|~/.mozilla/firefox/userprofile/chrome/userChrome.css}} file will place the icon before the text:

Adding the following to your {{ic|~/.mozilla/firefox/userprofile/chrome/userChrome.css}} file will place the icon before the text:

−

{{bc|#appmenu-toolbar-button {

+

{{bc|

+

#appmenu-toolbar-button {

list-style-image: url("chrome://branding/content/icon16.png");

list-style-image: url("chrome://branding/content/icon16.png");

}

}

}}

}}

+

Adding the following to the same file will ''remove'' the "Firefox" text:

Adding the following to the same file will ''remove'' the "Firefox" text:

−

{{bc|#appmenu-toolbar-button > .toolbarbutton-text,

+

{{bc|

+

#appmenu-toolbar-button > .toolbarbutton-text,

#appmenu-toolbar-button > .toolbarbutton-menu-dropmarker {

#appmenu-toolbar-button > .toolbarbutton-menu-dropmarker {

display: none !important;

display: none !important;

+

}

+

}}

+

+

+

This userChrome.css configuration copies the default Windows Firefox 4+ look and adds an orange background to the button, with a purple background in Private Browsing mode:

If Firefox launches something other than your preferred file manager when using the "Open Containing Folder" option in the Downloads manager, make sure you select your file manager of choice (e.g. Dolphin) in KDE's System Settings:

+

If Firefox launches something other than your preferred file manager when using the "Open Containing Folder" option in the Downloads manager, make sure you select your file manager of choice (e.g. [[Dolphin]]) in KDE's System Settings under ''Workspace Appearance and Behavior > Default Applications > File Manager''.

−

:'''System Settings -> Default Applications -> File Manager'''

−

If you have already selected your file manager of choice and Cervisia (or a file manager other than your favorite) is opening modify your user's {{ic|~/.local/share/applications/defaults.list}} to include these two lines:

+

If Firefox is still not opening your file manager of choice, modify your user's {{ic|~/.local/share/applications/defaults.list}} to include these two lines:

=== Firefox keeps creating ~/Desktop even when this is not desired ===

=== Firefox keeps creating ~/Desktop even when this is not desired ===

−

Firefox use Desktop as the default place for download and upload files. To set it to other folder, create {{ic|~/.config/user-dirs.dirs}} and add:

+

Firefox uses {{ic|~/Desktop}} as the default place for download and upload files. To set it to another folder, create {{ic|~/.config/user-dirs.dirs}} and add:

XDG_DESKTOP_DIR="/home/<user>/"

XDG_DESKTOP_DIR="/home/<user>/"

XDG_DOWNLOAD_DIR="/home/<user>/<dir>"

XDG_DOWNLOAD_DIR="/home/<user>/<dir>"

Line 112:

Line 175:

Change {{ic|<user>}} and {{ic|<dir>}} to the actual directory.

Change {{ic|<user>}} and {{ic|<dir>}} to the actual directory.

−

=== How to prevent plugins from allowing popups? ===

+

=== Make plugins respect blocked pop-ups ===

−

Ever wondered why pop-ups appear even though you have blocked them? It seems that the Flash plugin can bypass default settings and annoy us with those pesky pop-ups. Fear not, for we can prevent it from doing that.

+

Some plugins can misbehave and bypass the default settings, such as the Flash plugin. You can prevent this by doing the following:

−

To get around it:

+

# Type {{ic|about:config}} into the address bar.

−

# Type about:config into the Firefox location bar.

+

# Right-click on the page and select {{ic|New}} and then {{ic|Integer}}.

−

# Right-click on the page and select New and then Integer.

+

# Name it {{ic|privacy.popups.disable_from_plugins}}.

−

# Name it privacy.popups.disable_from_plugins

# Set the value to 2.

# Set the value to 2.

The possible values are:

The possible values are:

−

* 0: Allow all popups from plugins.

+

* '''0''': Allow all popups from plugins.

−

* 1: Allow popups, but limit them to dom.popup_maximum.

+

* '''1''': Allow popups, but limit them to dom.popup_maximum.

−

* 2: Block popups from plugins.

+

* '''2''': Block popups from plugins.

−

* 3: Block popups from plugins, even on whitelisted sites.

+

* '''3''': Block popups from plugins, even on whitelisted sites.

=== Middle-click errors ===

=== Middle-click errors ===

−

! The URL is not valid and cannot be loaded.

+

A common error message you can get while using the middle mouse button in Firefox is:

+

The URL is not valid and cannot be loaded.

+

Another symptom is that middle-clicking results in unexpected behavior, like accessing a random web page.

Another symptom is that middle-clicking results in unexpected behavior, like accessing a random web page.

−

The reason stems from the use of the middle mouse buttons in UNIX-like operating systems. The middle mouse button is used to paste whatever text has been highlighted/added to the clipboard. Then there is the possibly conflicting feature in Firefox, which defaults to loading the URL of the corresponding text when the button is depressed. This can be disabled like so:

+

The reason stems from the use of the middle mouse buttons in UNIX-like operating systems. The middle mouse button is used to paste whatever text has been highlighted/added to the clipboard. Then there is the possibly conflicting feature in Firefox, which defaults to loading the URL of the corresponding text when the button is depressed. This can be easily disabled by going to {{ic|about:config}} and setting the {{ic|middlemouse.contentLoadURL}} option to '''false'''.

−

−

Open the browser, and type the following into the address bar:

−

about:config

−

Search for '''middlemouse.contentLoadURL''' and set it to false.

−

Alternatively, having the traditional scroll cursor on middle-click (default behaviour on Windows browsers) can be achieved by searching for '''general.autoScroll''' and setting it to true.

+

Alternatively, having the traditional scroll cursor on middle-click (default behavior on Windows browsers) can be achieved by searching for {{ic|general.autoScroll}} and setting it to '''true'''.

=== Backspace does not work as the 'Back' button ===

=== Backspace does not work as the 'Back' button ===

−

As per [http://ubuntu.wordpress.com/2006/12/21/fix-firefox-backspace-to-take-you-to-the-previous-page/ this article], the feature has been removed in order to fix a bug. Follow the next steps to retain the original behaviour.

+

As per [http://ubuntu.wordpress.com/2006/12/21/fix-firefox-backspace-to-take-you-to-the-previous-page/ this article], the feature has been removed in order to fix a bug. To re-introduce the original behavior go to {{ic|about:config}} and set the {{ic|browser.backspace_action}} option to '''0''' (zero).

−

Open the browser and type the following address:

+

=== Firefox does not remember login information ===

−

about:config

+

It may be due to a corrupted {{ic|cookies.sqlite}} file in [http://support.mozilla.com/en-US/kb/Profiles#How_to_find_your_profile Firefox's profile] folder. In order to fix this, just rename or remove {{ic|cookie.sqlite}} while Firefox is not running.

−

Search for '''browser.backspace_action''' and set it to 0 (zero).

−

−

=== Firefox does not remember login information ===

−

It may be cause of a corrupted {{ic|cookies.sqlite}} file in [http://support.mozilla.com/en-US/kb/Profiles#How_to_find_your_profile Firefox's profile] folder. In order to fix this, just rename or remove the cookie.sqlite while Firefox is not running.

Open a terminal of choice and type the following:

Open a terminal of choice and type the following:

Line 156:

Line 212:

Restart Firefox and see if it solved the problem.

Restart Firefox and see if it solved the problem.

−

=== Broken websites / input fields with dark Gtk Themes ===

+

=== Unreadable input fields with dark GTK+ themes ===

−

When using a dark [[GTK]] theme, one might encounter Internet pages with unreadable input and text fields (p.e. Amazon - white text on white background). This can happen because the site only sets either background or text color, and Firefox takes the other one from the theme.

+

When using a dark [[GTK+]] theme, one might encounter Internet pages with unreadable input and text fields (e.g. Amazon can have white text on white background). This can happen because the site only sets either background or text color, and Firefox takes the other one from the theme.

−

A work around is to explicitly setting standard colours for all web pages in {{ic|~/.mozilla/firefox/.../chrome/userContent.css}}.

+

A work around is to explicitly setting standard colors for all web pages in {{ic|~/.mozilla/firefox/xxxxxxxx.default/chrome/userContent.css}}.

The following sets input fields to standard black text / white background; both can be overridden by the displayed site, so that colors are seen as intended:

The following sets input fields to standard black text / white background; both can be overridden by the displayed site, so that colors are seen as intended:

Line 170:

Line 226:

textarea {

textarea {

+

-moz-appearance: none !important;

+

background-color: white;

+

color: black;

+

}

+

+

select {

-moz-appearance: none !important;

-moz-appearance: none !important;

background-color: white;

background-color: white;

Line 175:

Line 237:

}

}

}}

}}

−

This will force the colours ("Allow paged to choose their own colors [..]" setting, in the '''Preferences > Content > Color''' dialog):

+

+

This will force the colors ("Allow pages to choose their own colors..." checkbox in the ''Preferences > Content > Color'' dialog):

{{bc|

{{bc|

input {

input {

Line 184:

Line 247:

textarea {

textarea {

+

-moz-appearance: none !important;

+

background-color: pink !important;

+

color: green !important;

+

}

+

+

select {

-moz-appearance: none !important;

-moz-appearance: none !important;

background-color: pink !important;

background-color: pink !important;

Line 192:

Line 261:

=== File association problems ===

=== File association problems ===

−

For non-[[GNOME]] users, Firefox may not associate file types (in the "Open With" part of the download dialog). Installing {{Pkg|libgnome}} amends the problem:

+

For non-[[GNOME]] users, Firefox may not associate file types properly or at all (in the "Open With" part of the download dialog). Installing {{Pkg|libgnome}} from the [[official repositories]] amends the problem.

=== "Do you want Firefox to save your tabs for the next time it starts?" dialog does not appear ===

=== "Do you want Firefox to save your tabs for the next time it starts?" dialog does not appear ===

From the [http://support.mozilla.com/en-US/questions/767751 Mozilla Support] site:

From the [http://support.mozilla.com/en-US/questions/767751 Mozilla Support] site:

−

# Type "'''about:config'''" in the address bar.

+

# Type {{ic|about:config}} in the address bar.

−

# Set '''browser.warnOnQuit''' to '''true'''.

+

# Set {{ic|browser.warnOnQuit}} to '''true'''.

−

# Set '''browser.showQuitWarning''' to '''true'''.

+

# Set {{ic|browser.showQuitWarning}} to '''true'''.

−

−

=== Firefox has high CPU usage and feels slow on scrolling with nVidia GPUs ===

−

−

In some cases, forcing the proprietary nVidia driver to store pixmaps in video memory instead of system memory can yield massive improvements in the perceived performance of pixmap-intensive applications like Firefox. Run

−

$ nvidia-settings -a InitialPixmapPlacement=2

+

=== Firefox uses ugly fonts for its interface ===

−

from the terminal; if desired results are achieved add this line to a script and use your desktop environment's autorun facilities to execute it on every startup. Alternatively, add the parameter to your {{ic|~/.nvidia-settings-rc}} and run

+

If the fonts in the menu bar look ugly to you, chances are you're missing better looking fonts for Firefox to use. As a quick remedy, just install Type 1 fonts from the {{Pkg|xorg-fonts-type1}} package, available in the official repositories.

−

−

$ nvidia-settings --load-config-only

−

−

on startup. This setting is documented in [http://cgit.freedesktop.org/~aplattner/nvidia-settings/tree/src/libXNVCtrl/NVCtrl.h?id=b27db3d10d58b821e87fbe3f46166e02dc589855#n2797 nvidia-settings source code]. Make sure you have added other perfomance-improving settings, see [[NVIDIA]].

:An account of the trademark issues from the Firefox package maintainer for Debian.

+

Some Firefox font issues may also be solved by installing Google Webfonts via {{AUR|ttf-google-webfonts}} or {{AUR|ttf-google-webfonts-git}}. These fonts greatly improved the appearance of Google Drive apps.

−

* [http://www.gnu.org/software/gnuzilla/ Gnuzilla and IceWeasel]

+

−

:Official website for the GNU Mozilla forks.

+

=== The menu cannot pop-up after updating to Firefox 13 ===

+

This problem is most probably related to this [https://bugzilla.mozilla.org/show_bug.cgi?id=787943 bug] and it may affect any user that sets

+

GTK_IM_MODULE=xim

+

+

while configuring their input method.

+

+

It appears to happen especially to those who are using [[Fcitx]] 4.0.x (at that time Fcitx only supported XIM). With newer version of Fcitx, XIM is discouraged and you should set:

Installing

There are a number of language packs available for Firefox, other than the standard English. Language packs are usually named as firefox-i18n-languagecode (where languagecode can be any language code, such as de, ja, fr, etc.). For a list of available language packs see this.

Add-ons

Firefox is well known for its large library of add-ons which can be used to add new features or modify the behavior of existing features of Firefox. You can find new add-ons or manage installed add-ons with Firefox's "Add-ons Manager."

GNOME Keyring integration

KDE integration

To use KDE's KPart technology with Firefox, by embedding different KDE file viewers into the browser, you can install kpartsplugin.

To get further integration with KDE's Oxygen theme, you can install Oxygen KDE, a very comprehensive theme that also has color scheme detection, support for Firefox's Persona themes, support for both the Oxygen and Faenza icons and various other customizations.

For integration with KDE’s mime type system and file dialogs, one can use a version of firefox with OpenSUSE’s patches applied.

Dictionaries for spell checking

To enable spell checking for a specific language right click on any text field and check the Check Spelling box. To select a language for spell checking to you have right click again and select your language from the Languages sub-menu.

To get more languages just click Add Dictionaries... and select the dictionary you want to install from the list.

Troubleshooting

Setting your e-mail client

Firefox is usually set to open mailto links with a web application such as Gmail or Yahoo Mail. To set your e-mail client in Firefox to use with mailto links, go to Preferences > Applications and modify the action column corresponding to the mailto content type. You have set this to the exact location of your e-mail client (e.g. /usr/bin/kmail for Kmail).

Firefox 4 New Menu Bar/Firefox Button

This article or section is a candidate for merging with Firefox Tweaks.

Notes: This is just style tweaks, should better keep it in tweak page to keep main page clean. (Discuss in Talk:Firefox#)

To toggle between the new Firefox button and the classic menu bar:

if the button is active, check Preferences > Menu Bar, or right click in the toolbar area and check Menu Bar.

if the menu bar is active, uncheck View > Toolbars > Menu Bar, or right click in the toolbar area and uncheck Menu Bar.

In GNU/Linux, you will just get a plain grey button instead of the new orange one from Windows. However you can change this to either a Firefox icon or the icon followed by the "Firefox" text.

Adding the following to your ~/.mozilla/firefox/userprofile/chrome/userChrome.css file will place the icon before the text:

Make plugins respect blocked pop-ups

Some plugins can misbehave and bypass the default settings, such as the Flash plugin. You can prevent this by doing the following:

Type about:config into the address bar.

Right-click on the page and select New and then Integer.

Name it privacy.popups.disable_from_plugins.

Set the value to 2.

The possible values are:

0: Allow all popups from plugins.

1: Allow popups, but limit them to dom.popup_maximum.

2: Block popups from plugins.

3: Block popups from plugins, even on whitelisted sites.

Middle-click errors

A common error message you can get while using the middle mouse button in Firefox is:

The URL is not valid and cannot be loaded.

Another symptom is that middle-clicking results in unexpected behavior, like accessing a random web page.

The reason stems from the use of the middle mouse buttons in UNIX-like operating systems. The middle mouse button is used to paste whatever text has been highlighted/added to the clipboard. Then there is the possibly conflicting feature in Firefox, which defaults to loading the URL of the corresponding text when the button is depressed. This can be easily disabled by going to about:config and setting the middlemouse.contentLoadURL option to false.

Alternatively, having the traditional scroll cursor on middle-click (default behavior on Windows browsers) can be achieved by searching for general.autoScroll and setting it to true.

Backspace does not work as the 'Back' button

As per this article, the feature has been removed in order to fix a bug. To re-introduce the original behavior go to about:config and set the browser.backspace_action option to 0 (zero).

Firefox does not remember login information

It may be due to a corrupted cookies.sqlite file in Firefox's profile folder. In order to fix this, just rename or remove cookie.sqlite while Firefox is not running.

Open a terminal of choice and type the following:

$ cd ~/.mozilla/firefox/xxxxxxxx.default/
$ rm -f cookies.sqlite

Note: xxxxxxxx represents a random string of 8 characters.

Restart Firefox and see if it solved the problem.

Unreadable input fields with dark GTK+ themes

When using a dark GTK+ theme, one might encounter Internet pages with unreadable input and text fields (e.g. Amazon can have white text on white background). This can happen because the site only sets either background or text color, and Firefox takes the other one from the theme.

A work around is to explicitly setting standard colors for all web pages in ~/.mozilla/firefox/xxxxxxxx.default/chrome/userContent.css.

The following sets input fields to standard black text / white background; both can be overridden by the displayed site, so that colors are seen as intended:

"Do you want Firefox to save your tabs for the next time it starts?" dialog does not appear

Firefox uses ugly fonts for its interface

If the fonts in the menu bar look ugly to you, chances are you're missing better looking fonts for Firefox to use. As a quick remedy, just install Type 1 fonts from the xorg-fonts-type1 package, available in the official repositories.

Firefox uses ugly fonts on certain webpages

When Firefox uses bitmap fonts, it can happen that on certain webpages the fonts are very ugly (compared to Google Chrome for example):